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Official Weaviate Java Client

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weaviate/java-client

A Java native client for Weaviate.

Usage

To start using Weaviate Java client add this dependency topom.xml:

<dependency>    <groupId>io.weaviate</groupId>    <artifactId>client</artifactId>    <version>5.5.0</version></dependency>

For applications on Java 9 or above

The client utilizes Gson for JSON serialization/deserialization and Gson uses reflection of internaljava.lang classesto do it. This is not allowed by default in Java 9 and above.

To work around this, it's necessary to add this JVM commandline argument:

--add-opens=java.base/java.lang=ALL-UNNAMED

If you're using Gradle, you can add this instead to yourapplication block in yourbuild.gradle.kts file:

applicationDefaultJvmArgs+=listOf("--add-opens=java.base/java.lang=ALL-UNNAMED",)

Here's a simple code to start up working with Java client:

  1. Add dependency to your java project.

  2. Connect to Weaviate onlocalhost:8080 and fetch meta information

packageio.weaviate;importio.weaviate.client.Config;importio.weaviate.client.WeaviateClient;importio.weaviate.client.base.Result;importio.weaviate.client.v1.misc.model.Meta;publicclassApp {publicstaticvoidmain(String[]args) {Configconfig =newConfig("http","localhost:8080");WeaviateClientclient =newWeaviateClient(config);Result<Meta>meta =client.misc().metaGetter().run();if (meta.hasErrors()) {System.out.printf("Error: %s\n",meta.getError().getMessages());    }else {System.out.printf("meta.hostname: %s\n",meta.getResult().getHostname());System.out.printf("meta.version: %s\n",meta.getResult().getVersion());System.out.printf("meta.modules: %s\n",meta.getResult().getModules());    }  }}

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